Foundation Summary

The "Foundation Summary" section of each chapter lists the most important facts from the chapter. Although this section does not list every fact from the chapter that will be on your INTRO exam, a well-prepared CCNA candidate should know, at a minimum, all the details in each "Foundation Summary" section before going to take the exam.

The 2950 CLI works just like the router IOS. Some of the commands that you use are different because switches perform different tasks than routers, but the process and the look and feel are the same. For instance:

■ It uses user exec and priviledged (enable) exec modes.

■ It uses the enable and disable commands to move between the two.

■ It uses a console password and Telnet (vty) password, configured just like a router.

■ It uses an enable secret or just plain enable password, with the enable secret password taking precedence if both are configured.

■ It uses the same editing keystrokes that allow you to retrieve previous commands and change the commands.

Only a few minor differences exist between 2950 switches and routers relating to how to access the switch and use the CLI. The first difference is that there is no auxiliary port on a switch. The other is that the commands used on the switch can be different from those used on a router because switches perform different functions than do routers.

To access the 2950 switch CLI, you can use one of two methods, as illustrated in Figure 8-4.

Figure 8-4 2950 CLI Access

2950 Switch

RJ-45

RJ-45

2950 Switch

RJ-45

Telnet

Telnet

The configuration process and the configuration files used are identical when comparing the router IOS behavior and a 2950 switch. So there is nothing more to learn as compared with the router IOS. In other words, the following are true:

■ You use the configure terminal command from enable mode to enter configuration mode.

■ Your configuration commands change the configuration of the switch the instant you press Enter at the end of each command.

■ The help shown in configuration mode changes, depending on what configuration submode you are in.

■ The copy running-config startup-config command saves the configuration to the permanent configuration file in NVRAM.

■ The startup-config file is stored in NVRAM, and the switch OS is stored in Flash.

■ All the variations of the copy command work just like they do on a router.

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